I think we should take a moment to seriously consider the OP's point - I personally am very concerned about the toxicity of the foodchain. I plan to start eating meat that I can be certain is free range and has only been fed a good quality diet that doesn't include other animals.

I am thinking of going back to the days where we grew our own veg in the garden so I know a carrot is a carrot and potato is a potato, I would also like to buy a pig as I adore bacon butties but would get attached to the pig, my only option is butchers or vegetables.